How did they come up with these specific fractions?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question

How did they come up with these specific fractions?

 

 

 

CPU
Memory
Disk
Terminal
Printer
Job History
0
Uniprogramming
JOBI
T
5
10
JOB2
T
T
15
minutes
20
JOB3
25
tim e
-20%
CPU: 70%*1/6+10%*3/6+10%*2/6 = 120/6 = 20%
Response Time: JOB1: 5min JOB2:20min JOB3:30min
Avg. Resp. Time: (5+20+30)/3 = 55/3 = 18 minutes
Throughput:
3 jobs in 30 min = 6 jobs/hr
100%
-0%
100%
-0%
-100%
-0%
30
100%
-0%
-100%
0%
Multiprogramming
CPU
Memory
Disk
Terminal
Printer
Job History
0
JOBI
JOB2
JOB3
T
5
10
, minutes
-100%
-0%
-100%
-0%
-100%
-0%
-100%
-0%
-100%
-0%
15
tim e
90%*1/3+20%*1/3+10%*1/3 = 120/3 = 40%
JOB1: 5min JOB2:15min JOB3:10min
(5+15+10)/3 = 30/3 = 10 minutes
3 jobs in 15 min = 12 jobs/hr
Transcribed Image Text:CPU Memory Disk Terminal Printer Job History 0 Uniprogramming JOBI T 5 10 JOB2 T T 15 minutes 20 JOB3 25 tim e -20% CPU: 70%*1/6+10%*3/6+10%*2/6 = 120/6 = 20% Response Time: JOB1: 5min JOB2:20min JOB3:30min Avg. Resp. Time: (5+20+30)/3 = 55/3 = 18 minutes Throughput: 3 jobs in 30 min = 6 jobs/hr 100% -0% 100% -0% -100% -0% 30 100% -0% -100% 0% Multiprogramming CPU Memory Disk Terminal Printer Job History 0 JOBI JOB2 JOB3 T 5 10 , minutes -100% -0% -100% -0% -100% -0% -100% -0% -100% -0% 15 tim e 90%*1/3+20%*1/3+10%*1/3 = 120/3 = 40% JOB1: 5min JOB2:15min JOB3:10min (5+15+10)/3 = 30/3 = 10 minutes 3 jobs in 15 min = 12 jobs/hr
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